Ex suggests to see me and when I get anxious, I express and he responds like this. Advice?

Ex and I dated for a year and we broke up almost 6 months ago. When he did, he expressed a lot of doubt and still does to this day. He cried too when we broke up. He was initiating a lot of contact in Feb/March, wanting to see me and clear the air but I declined. I ended up responding to one of his messages once and for all about 2 months later. He replied to what I said and then said it has 'been very difficult from his end. He felt it was the most appropriate thing was to break up, which has been really hard and he misses me all the time. But what's the alternative?

He then went on to say that it's really difficult but he tries to leave me alone as he doesn't quite know what to do as he doesn't want to mess with me. I replied and said I hope one day we can be on friendlier terms but I understand if we don’t keep in touch. 2 weeks later he texted me saying he would definitely like to know how I am/how life is but he’s conscious of not lingering around and making things more difficult and he hopes everything is good and I’m happier now. That he of course feels the same but it’s just the nature of breakups.

I responded, in a kind way that we should probably not keep in contact as I still like him. He responded, apologised for how long it took him to get back to me and said he still likes me and cares about me but thinks probably not talking at the moment is the right thing. I responded and said that I didn’t want to seem sarcastic previously but wouldn’t the alternative be to work through our issues like an adult, I went onto say that we meshed well so maybe that’s why it’s been so hard and wished him well. He replied days later, apologising again. Said he would rather not get into this discussion over text and would much prefer in-person, agreed that we meshed really well and we had a similar sense of humour. Said he hoped I had a good trip and then he hopes my university has been going well lately.
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I said that maybe we can revisit it soon and talk in person and I felt the same regarding talking about this over text. We laughed about a few things like we used to and he then went onto ask when my exams are and a few other things. I left it at that and then reached out to him today. I reached out to him and told him that I don't see the benefit in catching up unless he wants to date me again as I get the indication that he still wants the break up. He said he understood but didn't answer it.
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Whether that's intentional or not. For example he could've said something like "yes, I still want the break up" but just says he understands. I said we should stop being in contact for real and for him to only contact me if he wants to be back together. He sort of turned it into a joke and asked about when I'm graduating. Was like 'can you please clarify this curiosity' and said he will abide by my wishes, I then stupidly kept the conversation going, he laughed at things I said.
Ex suggests to see me and when I get anxious, I express and he responds like this. Advice?
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